[polymer] switch comment style

pkg/polymer/lib/src/build/build_filter.dart

Index: pkg/polymer/lib/src/build/build_filter.dart
diff --git a/pkg/polymer/lib/src/build/build_filter.dart b/pkg/polymer/lib/src/build/build_filter.dart
index 5314a0d8047a9dd90d7be20b93debc5faf124af3..fc2138d72e654eb485e0deafe7b9d20850b8dd34 100644
--- a/pkg/polymer/lib/src/build/build_filter.dart
+++ b/pkg/polymer/lib/src/build/build_filter.dart
@@ -2,10 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/**
- * Final phase of the polymer transformation: removes any files that are not
- * needed for deployment.
- */
+/// Final phase of the polymer transformation: removes any files that are not
+/// needed for deployment.
 library polymer.src.build.build_filter;
 
 import 'dart:async';
@@ -13,10 +11,8 @@ import 'dart:async';
 import 'package:barback/barback.dart';
 import 'common.dart';
 
-/**
- * Removes any files not needed for deployment, such as internal build artifacts
- * and non-entry HTML files.
- */
+/// Removes any files not needed for deployment, such as internal build
+/// artifacts and non-entry HTML files.
 class BuildFilter extends Transformer with PolymerTransformer {
   final TransformOptions options;
   BuildFilter(this.options);